fix bug in ENABLE_METHOD_CACHE and enable for llvm

.github/workflows/test.yml

@@ -92,7 +92,7 @@ jobs:
     - name: Install Dependencies
       run: pip install -e '.[llvm,testing]' --extra-index-url https://download.pytorch.org/whl/cpu
     - name: Run Pytest
-      run: LLVM=1 python -m pytest -s -v -n=auto
+      run: ENABLE_METHOD_CACHE=1 LLVM=1 python -m pytest -s -v -n=auto
 
   testtorch:
     name: Torch Tests